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<pre><code class="language-c"> #include &lt;signum.h&gt; // /usr/include/bits/signum.h

#define	SIGHUP		1	/* [T] Hangup (POSIX).  */
#define	SIGINT		2	/* [T] Interrupt (ANSI).  */
#define	SIGQUIT		3	/* [A] Quit (POSIX).  */
#define	SIGILL		4	/* [A] Illegal instruction (ANSI).  */
#define	SIGTRAP		5	/* [A] Trace trap (POSIX).  */
#define	SIGABRT		6	/* [A] Abort (ANSI).  */
#define	SIGIOT		6	/*     IOT trap (4.2 BSD).  */
#define	SIGBUS		7	/* [A] BUS error (4.2 BSD).  */
#define	SIGFPE		8	/* [A] Floating-point exception (ANSI).  */
#define	SIGKILL		9	/* [T] Kill, unblockable (POSIX).  */
#define	SIGUSR1		10	/* [T] User-defined signal 1 (POSIX).  */
#define	SIGSEGV		11	/* [A] Segmentation violation (ANSI).  */
#define	SIGUSR2		12	/* [T] User-defined signal 2 (POSIX).  */
#define	SIGPIPE		13	/* [T] Broken pipe (POSIX).  */
#define	SIGALRM		14	/* [T] Alarm clock (POSIX).  */
#define	SIGTERM		15	/* [T] Termination (ANSI).  */
#define	SIGSTKFLT	16	/*     Stack fault.  */
#define	SIGCHLD		17	/* [I] Child status has changed (POSIX).  */
#define	SIGCONT		18	/* [C] Continue (POSIX).  */
#define	SIGSTOP		19	/* [S] Stop, unblockable (POSIX).  */
#define	SIGTSTP		20	/* [S] Keyboard stop (POSIX).  */
#define	SIGTTIN		21	/* [S] Background read from tty (POSIX).  */
#define	SIGTTOU		22	/* [S] Background write to tty (POSIX).  */
#define	SIGURG		23	/* [I] Urgent condition on socket (4.2 BSD).  */
#define	SIGXCPU		24	/* [A] CPU limit exceeded (4.2 BSD).  */
#define	SIGXFSZ		25	/* [A] File size limit exceeded (4.2 BSD).  */
#define	SIGVTALRM	26	/* [T] Virtual alarm clock (4.2 BSD).  */
#define	SIGPROF		27	/* [T] Profiling alarm clock (4.2 BSD).  */
#define	SIGWINCH	28	/*     Window size change (4.3 BSD, Sun).  */
#define	SIGPOLL		29	/* [T] Pollable event occurred (System V).  */
#define	SIGIO		29	/* [T] I/O now possible (4.2 BSD).  */
#define	SIGPWR		30	/*     Power failure restart (System V).  */
#define SIGSYS		31	/* [A] Bad system call.  */
#define SIGUNUSED	31</code></pre>

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